The system is a slotted-aloha system with multiple receivers, andtransmissions in a slot do not always collide. The arrival process isassumed to be Poisson. Each transmission (arrival) is then aligned intime slot of length T sec. The frequency of each transmission isselected in random (uniformly distributed) over frequency range F.

A collision is only declared, when two (or more) transmissions in thesame timeslot are within Fc Hz (i.e. F1- F2 <= Fc) of each other.

The system is also limited to N receivers per timeslot, i.e. if morethe N transmissions are not collided in one timeslot, they will belost.

The object is find the throughtput of the system in terms of averageno. of success transmission per time slot.